body{
    width: 100%;
    height: 100%;
}
.main{
    width: 100%;
    max-width: 1900px; /* 设置最大宽度，避免在大屏幕上过度拉伸 */
    height: 650px;
    border: 1px solid #333; /* 颜色改为更合适的深灰色 */
    margin: 0 auto; /* 水平居中 */
    position: relative;
    box-sizing: border-box;
}
.title{
    font-size: 48px;
    font-family: "FangSong";
    font-weight: bolder;
    padding: 86px 165px;
}
.main .content{
    background-image: url(../images/index-background.png);
    background-repeat: no-repeat;
    background-size: cover;
    background-position-y: 27%;
    width: 100%;
    height: 690px;
}
.about{
    display:inline-block;
    float: right;
    margin-top: 21px;
    margin-right: 15px;
    background: #082bb81a;
    
}

li{
    width: 115.6px;
    height: 67.2px;
    display: inline-block;
    padding: 45px;
    margin: 45px;
    cursor: pointer;
}
h3{
    font-size: 23.1px;
    font-weight: bold;
}
.content a{
    text-decoration: none;
    color: white;
}
.line1{
    margin-left: 27%;
    margin-top: 279.8px;
    background: #de1010;
    float: left;
}
.line2{
    margin-top: 279.8px;
    background: #2b0dd7;
    float: left;
}
.line3{
    margin-top: 279.8px;
    background: #e86a0a;
    float: left;
}
